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Linux/drivers/usb/host/ohci-s3c2410.c

  1 /*
  2  * OHCI HCD (Host Controller Driver) for USB.
  3  *
  4  * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
  5  * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
  6  * (C) Copyright 2002 Hewlett-Packard Company
  7  *
  8  * USB Bus Glue for Samsung S3C2410
  9  *
 10  * Written by Christopher Hoover <ch@hpl.hp.com>
 11  * Based on fragments of previous driver by Russell King et al.
 12  *
 13  * Modified for S3C2410 from ohci-sa1111.c, ohci-omap.c and ohci-lh7a40.c
 14  *      by Ben Dooks, <ben@simtec.co.uk>
 15  *      Copyright (C) 2004 Simtec Electronics
 16  *
 17  * Thanks to basprog@mail.ru for updates to newer kernels
 18  *
 19  * This file is licenced under the GPL.
 20 */
 21 
 22 #include <linux/clk.h>
 23 #include <linux/io.h>
 24 #include <linux/kernel.h>
 25 #include <linux/module.h>
 26 #include <linux/platform_device.h>
 27 #include <linux/platform_data/usb-ohci-s3c2410.h>
 28 #include <linux/usb.h>
 29 #include <linux/usb/hcd.h>
 30 
 31 #include "ohci.h"
 32 
 33 
 34 #define valid_port(idx) ((idx) == 1 || (idx) == 2)
 35 
 36 /* clock device associated with the hcd */
 37 
 38 
 39 #define DRIVER_DESC "OHCI S3C2410 driver"
 40 
 41 static const char hcd_name[] = "ohci-s3c2410";
 42 
 43 static struct clk *clk;
 44 static struct clk *usb_clk;
 45 
 46 /* forward definitions */
 47 
 48 static void s3c2410_hcd_oc(struct s3c2410_hcd_info *info, int port_oc);
 49 
 50 /* conversion functions */
 51 
 52 static struct s3c2410_hcd_info *to_s3c2410_info(struct usb_hcd *hcd)
 53 {
 54         return dev_get_platdata(hcd->self.controller);
 55 }
 56 
 57 static void s3c2410_start_hc(struct platform_device *dev, struct usb_hcd *hcd)
 58 {
 59         struct s3c2410_hcd_info *info = dev_get_platdata(&dev->dev);
 60 
 61         dev_dbg(&dev->dev, "s3c2410_start_hc:\n");
 62 
 63         clk_prepare_enable(usb_clk);
 64         mdelay(2);                      /* let the bus clock stabilise */
 65 
 66         clk_prepare_enable(clk);
 67 
 68         if (info != NULL) {
 69                 info->hcd       = hcd;
 70                 info->report_oc = s3c2410_hcd_oc;
 71 
 72                 if (info->enable_oc != NULL)
 73                         (info->enable_oc)(info, 1);
 74         }
 75 }
 76 
 77 static void s3c2410_stop_hc(struct platform_device *dev)
 78 {
 79         struct s3c2410_hcd_info *info = dev_get_platdata(&dev->dev);
 80 
 81         dev_dbg(&dev->dev, "s3c2410_stop_hc:\n");
 82 
 83         if (info != NULL) {
 84                 info->report_oc = NULL;
 85                 info->hcd       = NULL;
 86 
 87                 if (info->enable_oc != NULL)
 88                         (info->enable_oc)(info, 0);
 89         }
 90 
 91         clk_disable_unprepare(clk);
 92         clk_disable_unprepare(usb_clk);
 93 }
 94 
 95 /* ohci_s3c2410_hub_status_data
 96  *
 97  * update the status data from the hub with anything that
 98  * has been detected by our system
 99 */
100 
101 static int
102 ohci_s3c2410_hub_status_data(struct usb_hcd *hcd, char *buf)
103 {
104         struct s3c2410_hcd_info *info = to_s3c2410_info(hcd);
105         struct s3c2410_hcd_port *port;
106         int orig;
107         int portno;
108 
109         orig = ohci_hub_status_data(hcd, buf);
110 
111         if (info == NULL)
112                 return orig;
113 
114         port = &info->port[0];
115 
116         /* mark any changed port as changed */
117 
118         for (portno = 0; portno < 2; port++, portno++) {
119                 if (port->oc_changed == 1 &&
120                     port->flags & S3C_HCDFLG_USED) {
121                         dev_dbg(hcd->self.controller,
122                                 "oc change on port %d\n", portno);
123 
124                         if (orig < 1)
125                                 orig = 1;
126 
127                         buf[0] |= 1<<(portno+1);
128                 }
129         }
130 
131         return orig;
132 }
133 
134 /* s3c2410_usb_set_power
135  *
136  * configure the power on a port, by calling the platform device
137  * routine registered with the platform device
138 */
139 
140 static void s3c2410_usb_set_power(struct s3c2410_hcd_info *info,
141                                   int port, int to)
142 {
143         if (info == NULL)
144                 return;
145 
146         if (info->power_control != NULL) {
147                 info->port[port-1].power = to;
148                 (info->power_control)(port-1, to);
149         }
150 }
151 
152 /* ohci_s3c2410_hub_control
153  *
154  * look at control requests to the hub, and see if we need
155  * to take any action or over-ride the results from the
156  * request.
157 */
158 
159 static int ohci_s3c2410_hub_control(
160         struct usb_hcd  *hcd,
161         u16             typeReq,
162         u16             wValue,
163         u16             wIndex,
164         char            *buf,
165         u16             wLength)
166 {
167         struct s3c2410_hcd_info *info = to_s3c2410_info(hcd);
168         struct usb_hub_descriptor *desc;
169         int ret = -EINVAL;
170         u32 *data = (u32 *)buf;
171 
172         dev_dbg(hcd->self.controller,
173                 "s3c2410_hub_control(%p,0x%04x,0x%04x,0x%04x,%p,%04x)\n",
174                 hcd, typeReq, wValue, wIndex, buf, wLength);
175 
176         /* if we are only an humble host without any special capabilities
177          * process the request straight away and exit */
178 
179         if (info == NULL) {
180                 ret = ohci_hub_control(hcd, typeReq, wValue,
181                                        wIndex, buf, wLength);
182                 goto out;
183         }
184 
185         /* check the request to see if it needs handling */
186 
187         switch (typeReq) {
188         case SetPortFeature:
189                 if (wValue == USB_PORT_FEAT_POWER) {
190                         dev_dbg(hcd->self.controller, "SetPortFeat: POWER\n");
191                         s3c2410_usb_set_power(info, wIndex, 1);
192                         goto out;
193                 }
194                 break;
195 
196         case ClearPortFeature:
197                 switch (wValue) {
198                 case USB_PORT_FEAT_C_OVER_CURRENT:
199                         dev_dbg(hcd->self.controller,
200                                 "ClearPortFeature: C_OVER_CURRENT\n");
201 
202                         if (valid_port(wIndex)) {
203                                 info->port[wIndex-1].oc_changed = 0;
204                                 info->port[wIndex-1].oc_status = 0;
205                         }
206 
207                         goto out;
208 
209                 case USB_PORT_FEAT_OVER_CURRENT:
210                         dev_dbg(hcd->self.controller,
211                                 "ClearPortFeature: OVER_CURRENT\n");
212 
213                         if (valid_port(wIndex))
214                                 info->port[wIndex-1].oc_status = 0;
215 
216                         goto out;
217 
218                 case USB_PORT_FEAT_POWER:
219                         dev_dbg(hcd->self.controller,
220                                 "ClearPortFeature: POWER\n");
221 
222                         if (valid_port(wIndex)) {
223                                 s3c2410_usb_set_power(info, wIndex, 0);
224                                 return 0;
225                         }
226                 }
227                 break;
228         }
229 
230         ret = ohci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
231         if (ret)
232                 goto out;
233 
234         switch (typeReq) {
235         case GetHubDescriptor:
236 
237                 /* update the hub's descriptor */
238 
239                 desc = (struct usb_hub_descriptor *)buf;
240 
241                 if (info->power_control == NULL)
242                         return ret;
243 
244                 dev_dbg(hcd->self.controller, "wHubCharacteristics 0x%04x\n",
245                         desc->wHubCharacteristics);
246 
247                 /* remove the old configurations for power-switching, and
248                  * over-current protection, and insert our new configuration
249                  */
250 
251                 desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_LPSM);
252                 desc->wHubCharacteristics |= cpu_to_le16(0x0001);
253 
254                 if (info->enable_oc) {
255                         desc->wHubCharacteristics &= ~cpu_to_le16(
256                                 HUB_CHAR_OCPM);
257                         desc->wHubCharacteristics |=  cpu_to_le16(
258                                 0x0008 |
259                                 0x0001);
260                 }
261 
262                 dev_dbg(hcd->self.controller, "wHubCharacteristics after 0x%04x\n",
263                         desc->wHubCharacteristics);
264 
265                 return ret;
266 
267         case GetPortStatus:
268                 /* check port status */
269 
270                 dev_dbg(hcd->self.controller, "GetPortStatus(%d)\n", wIndex);
271 
272                 if (valid_port(wIndex)) {
273                         if (info->port[wIndex-1].oc_changed)
274                                 *data |= cpu_to_le32(RH_PS_OCIC);
275 
276                         if (info->port[wIndex-1].oc_status)
277                                 *data |= cpu_to_le32(RH_PS_POCI);
278                 }
279         }
280 
281  out:
282         return ret;
283 }
284 
285 /* s3c2410_hcd_oc
286  *
287  * handle an over-current report
288 */
289 
290 static void s3c2410_hcd_oc(struct s3c2410_hcd_info *info, int port_oc)
291 {
292         struct s3c2410_hcd_port *port;
293         struct usb_hcd *hcd;
294         unsigned long flags;
295         int portno;
296 
297         if (info == NULL)
298                 return;
299 
300         port = &info->port[0];
301         hcd = info->hcd;
302 
303         local_irq_save(flags);
304 
305         for (portno = 0; portno < 2; port++, portno++) {
306                 if (port_oc & (1<<portno) &&
307                     port->flags & S3C_HCDFLG_USED) {
308                         port->oc_status = 1;
309                         port->oc_changed = 1;
310 
311                         /* ok, once over-current is detected,
312                            the port needs to be powered down */
313                         s3c2410_usb_set_power(info, portno+1, 0);
314                 }
315         }
316 
317         local_irq_restore(flags);
318 }
319 
320 /* may be called without controller electrically present */
321 /* may be called with controller, bus, and devices active */
322 
323 /*
324  * usb_hcd_s3c2410_remove - shutdown processing for HCD
325  * @dev: USB Host Controller being removed
326  * Context: !in_interrupt()
327  *
328  * Reverses the effect of usb_hcd_3c2410_probe(), first invoking
329  * the HCD's stop() method.  It is always called from a thread
330  * context, normally "rmmod", "apmd", or something similar.
331  *
332 */
333 
334 static void
335 usb_hcd_s3c2410_remove(struct usb_hcd *hcd, struct platform_device *dev)
336 {
337         usb_remove_hcd(hcd);
338         s3c2410_stop_hc(dev);
339         usb_put_hcd(hcd);
340 }
341 
342 /**
343  * usb_hcd_s3c2410_probe - initialize S3C2410-based HCDs
344  * Context: !in_interrupt()
345  *
346  * Allocates basic resources for this USB host controller, and
347  * then invokes the start() method for the HCD associated with it
348  * through the hotplug entry's driver_data.
349  *
350  */
351 static int usb_hcd_s3c2410_probe(const struct hc_driver *driver,
352                                   struct platform_device *dev)
353 {
354         struct usb_hcd *hcd = NULL;
355         struct s3c2410_hcd_info *info = dev_get_platdata(&dev->dev);
356         int retval;
357 
358         s3c2410_usb_set_power(info, 1, 1);
359         s3c2410_usb_set_power(info, 2, 1);
360 
361         hcd = usb_create_hcd(driver, &dev->dev, "s3c24xx");
362         if (hcd == NULL)
363                 return -ENOMEM;
364 
365         hcd->rsrc_start = dev->resource[0].start;
366         hcd->rsrc_len   = resource_size(&dev->resource[0]);
367 
368         hcd->regs = devm_ioremap_resource(&dev->dev, &dev->resource[0]);
369         if (IS_ERR(hcd->regs)) {
370                 retval = PTR_ERR(hcd->regs);
371                 goto err_put;
372         }
373 
374         clk = devm_clk_get(&dev->dev, "usb-host");
375         if (IS_ERR(clk)) {
376                 dev_err(&dev->dev, "cannot get usb-host clock\n");
377                 retval = PTR_ERR(clk);
378                 goto err_put;
379         }
380 
381         usb_clk = devm_clk_get(&dev->dev, "usb-bus-host");
382         if (IS_ERR(usb_clk)) {
383                 dev_err(&dev->dev, "cannot get usb-bus-host clock\n");
384                 retval = PTR_ERR(usb_clk);
385                 goto err_put;
386         }
387 
388         s3c2410_start_hc(dev, hcd);
389 
390         retval = usb_add_hcd(hcd, dev->resource[1].start, 0);
391         if (retval != 0)
392                 goto err_ioremap;
393 
394         device_wakeup_enable(hcd->self.controller);
395         return 0;
396 
397  err_ioremap:
398         s3c2410_stop_hc(dev);
399 
400  err_put:
401         usb_put_hcd(hcd);
402         return retval;
403 }
404 
405 /*-------------------------------------------------------------------------*/
406 
407 static struct hc_driver __read_mostly ohci_s3c2410_hc_driver;
408 
409 static int ohci_hcd_s3c2410_drv_probe(struct platform_device *pdev)
410 {
411         return usb_hcd_s3c2410_probe(&ohci_s3c2410_hc_driver, pdev);
412 }
413 
414 static int ohci_hcd_s3c2410_drv_remove(struct platform_device *pdev)
415 {
416         struct usb_hcd *hcd = platform_get_drvdata(pdev);
417 
418         usb_hcd_s3c2410_remove(hcd, pdev);
419         return 0;
420 }
421 
422 #ifdef CONFIG_PM
423 static int ohci_hcd_s3c2410_drv_suspend(struct device *dev)
424 {
425         struct usb_hcd *hcd = dev_get_drvdata(dev);
426         struct platform_device *pdev = to_platform_device(dev);
427         bool do_wakeup = device_may_wakeup(dev);
428         int rc = 0;
429 
430         rc = ohci_suspend(hcd, do_wakeup);
431         if (rc)
432                 return rc;
433 
434         s3c2410_stop_hc(pdev);
435 
436         return rc;
437 }
438 
439 static int ohci_hcd_s3c2410_drv_resume(struct device *dev)
440 {
441         struct usb_hcd *hcd = dev_get_drvdata(dev);
442         struct platform_device *pdev = to_platform_device(dev);
443 
444         s3c2410_start_hc(pdev, hcd);
445 
446         ohci_resume(hcd, false);
447 
448         return 0;
449 }
450 #else
451 #define ohci_hcd_s3c2410_drv_suspend    NULL
452 #define ohci_hcd_s3c2410_drv_resume     NULL
453 #endif
454 
455 static const struct dev_pm_ops ohci_hcd_s3c2410_pm_ops = {
456         .suspend        = ohci_hcd_s3c2410_drv_suspend,
457         .resume         = ohci_hcd_s3c2410_drv_resume,
458 };
459 
460 static struct platform_driver ohci_hcd_s3c2410_driver = {
461         .probe          = ohci_hcd_s3c2410_drv_probe,
462         .remove         = ohci_hcd_s3c2410_drv_remove,
463         .shutdown       = usb_hcd_platform_shutdown,
464         .driver         = {
465                 .owner  = THIS_MODULE,
466                 .name   = "s3c2410-ohci",
467                 .pm     = &ohci_hcd_s3c2410_pm_ops,
468         },
469 };
470 
471 static int __init ohci_s3c2410_init(void)
472 {
473         if (usb_disabled())
474                 return -ENODEV;
475 
476         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
477         ohci_init_driver(&ohci_s3c2410_hc_driver, NULL);
478 
479         /*
480          * The Samsung HW has some unusual quirks, which require
481          * Sumsung-specific workarounds. We override certain hc_driver
482          * functions here to achieve that. We explicitly do not enhance
483          * ohci_driver_overrides to allow this more easily, since this
484          * is an unusual case, and we don't want to encourage others to
485          * override these functions by making it too easy.
486          */
487 
488         ohci_s3c2410_hc_driver.hub_status_data  = ohci_s3c2410_hub_status_data;
489         ohci_s3c2410_hc_driver.hub_control      = ohci_s3c2410_hub_control;
490 
491         return platform_driver_register(&ohci_hcd_s3c2410_driver);
492 }
493 module_init(ohci_s3c2410_init);
494 
495 static void __exit ohci_s3c2410_cleanup(void)
496 {
497         platform_driver_unregister(&ohci_hcd_s3c2410_driver);
498 }
499 module_exit(ohci_s3c2410_cleanup);
500 
501 MODULE_DESCRIPTION(DRIVER_DESC);
502 MODULE_LICENSE("GPL");
503 MODULE_ALIAS("platform:s3c2410-ohci");
504 

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